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        <h2 class="item-header">HTML 表格</h2>
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                <caption>太阳系中行星的一些数据。<a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/">（资料及图片取自 NASA
                        行星数据（公制单位））</a></caption>
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                    <tr>
                        <th>名称</th>
                        <th>图片</th>
                        <th>质量<br> Mass (10<sup>24</sup>kg)</th>
                        <th>直径<br> Diameter (km)</th>
                        <th>密度<br> Density (kg/m<sup>3</sup></th>
                        <th>重力<br> Gravity (m/s<sup>2</sup>)</th>
                        <th>天长<br> Length of Day (hours)</th>
                        <th>与太阳距离<br> Distance from Sun (10<sup>6</sup> km)</th>
                        <th>平均温度<br> Mean Temperature (C)</th>
                        <th>卫星数量<br> Number of Moons</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html">水星
                                    MERCURY</a></b></td>
                        <td><img src="./images/mercury.gif" alt="mercury"></td>
                        <td>0.330</td>
                        <td>4879</td>
                        <td>5427</td>
                        <td>3.7</td>
                        <td>4222.6</td>
                        <td>57.9</td>
                        <td>167</td>
                        <td>0</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html">金星
                                    VENUS</a></b></td>
                        <td><img src="./images/venus.gif" alt="venus"></td>
                        <td>4.87</td>
                        <td>12,104</td>
                        <td>5243</td>
                        <td>8.9</td>
                        <td>2802.0</td>
                        <td>108.2</td>
                        <td>177.4</td>
                        <td>0</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html">地球
                                    EARTH </a></b></td>
                        <td><img src="./images/earth.gif" alt="earth"></td>
                        <td>5.97</td>
                        <td>12,756</td>
                        <td>5514</td>
                        <td>9.8</td>
                        <td>24.0</td>
                        <td>149.6</td>
                        <td>15</td>
                        <td>1</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html">月球
                                    MOON </a></b></td>
                        <td><img src="./images/moon.gif" alt="moon"></td>
                        <td>0.073</td>
                        <td>3475</td>
                        <td>3340</td>
                        <td>1.6</td>
                        <td>708.7</td>
                        <td>0.384</td>
                        <td>-20</td>
                        <td>0</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html">火星
                                    MARS</a></b></td>
                        <td><img src="./images/mars.gif" alt="mars"></td>
                        <td>0.642</td>
                        <td>6792</td>
                        <td>3933</td>
                        <td>3.7</td>
                        <td>24.7</td>
                        <td>227.9</td>
                        <td>-65</td>
                        <td>2</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html">木星
                                    JUPITER </a></b></td>
                        <td><img src="./images/jupiter.gif" alt="jupiter"></td>
                        <td>1898</td>
                        <td>142,984</td>
                        <td>1326</td>
                        <td>23.1</td>
                        <td>9.9</td>
                        <td>778.6</td>
                        <td>-110</td>
                        <td>79</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html">土星
                                    SATURN</a></b></td>
                        <td><img src="./images/saturn.gif" alt="saturn"></td>
                        <td>568</td>
                        <td>120,536</td>
                        <td>687</td>
                        <td>9.0</td>
                        <td>10.7</td>
                        <td>1433.5</td>
                        <td>-140</td>
                        <td>62</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html">天王星
                                    URANUS </a></b></td>
                        <td><img src="./images/uranus.gif" alt="uranus"></td>
                        <td>86.8</td>
                        <td>51,118</td>
                        <td>1271</td>
                        <td>8.7</td>
                        <td>17.2</td>
                        <td>2872.5</td>
                        <td>-195</td>
                        <td>27</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html">海王星
                                    NEPTUNE</a></b></td>
                        <td><img src="./images/neptune.gif" alt="neptune"></td>
                        <td>102</td>
                        <td>49,528</td>
                        <td>1638</td>
                        <td>11.0</td>
                        <td>16.1</td>
                        <td>4495.1</td>
                        <td>-200</td>
                        <td>14</td>
                    </tr>
                    <tr>
                        <td><b><a href="https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html">冥王星
                                    PLUTO </a></b></td>
                        <td><img src="./images/plutofact.gif" alt="pluto"></td>
                        <td>0.0146</td>
                        <td>2370</td>
                        <td>2095</td>
                        <td>0.7</td>
                        <td>153.3</td>
                        <td>5906.4</td>
                        <td>-225</td>
                        <td>5</td>
                    </tr>
                </tbody>
                <tfoot>
                    <tr>
                        <td colspan="9">最后更新: 2018年7月18日</td>
                        <td>&nbsp;</td>
                    </tr>
                </tfoot>
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